Locking joint



April 14, 1931. HURASON I 1,800,349

LOCKING JOINT Filed Sept. 19, 1924 t 14 \IILIIHL 1 30 INVENTOR 4 Harry HZZIZZJWN;

' ATTORNEYS Patented Apr. 14, 1931 I UNITED-STATES- 'H RRY'HUR SON, or BROOKLYN, NEW YORK Lo'cKine JOINT Application filed September 19; 1924. Serial No. 238,576.

:1 sired angular relation to the brush so that convenient operation under varying conditions of use is-assured. An object of the invention isto provide an'inexpensive reliable locking joint of this character which maybe effectively locked in any desiredposition of adjustment. and which may be expeditiouslyand easily shifted and relocked to change the adjustment. V

The joint comprises a member adjustable v 1 2 about an axis normal to the brushhead to determine the vertical plane of the handle, the inclination of which is determined by rotary adjustment about avhorizontal axis carried by the member.

Preferably the two axesof, adjustment are substantially in, a plane disposed at right angles to the brush head or in other words, a plane which is normal to the surface to be operated on by the brush. By virtue of the above arrangement of the centers of adjustment, pressure on the handle'will always be translatedcinto substantially direct pressure urging the brush against the surfaceto be operated upon regardless of the angular relationship between the brush and handle. 7 In the accompanying drawings:

Figure 1 is a viewin side elevation of my improved locking. joint, showing the same in brush handle.

Figure 2 is a-similar view taken at right an les to Figure 1. a

igure 3 is a longitudinal sectional. view the two sets of radially disposed'teeth in inon the line 3-3 of Figure 2.

gered line 4-4 of Figure 1.

. Figure 5 is a'view in transverse section;

on the line 5'5 of Figure 2. p a I v Ihave designatedthe three main parts of the lock joint by the referencech aracters 10,

use as a coupling member for a brush and Figure 4 is a similar view on the stag adaptedto be secured to the head 11 of a brush 12-. Member 10a is adapted to be mounted upon the handle 13 of the brushand the member 10?) serves as a coupling member PATE OF 10a and 106 respectively. The member 10 is for connecting members 10 and 10a and per- 5 nifitting relative universal adjustment there- The particular shape of themember 10' depends entirely upon the character of the 'brush to which it is to be secured; With a brush having an arched or convexjback as shown, the member 10 is a substantiallyarcuate plate conforming tothe curved shape of the brush back and formed ;at.;its intermediate portion with a circular boss 15presenting a fiatsurface parallel to the surface to be operated upon by the brush. A central opening 16 through the boss permits the insertion of a screw or other appropriatese'curing device 17 for rigidly connecting, the member 10 to the back of the brush. 1 p

Member 10a is of general cylindrical shape throughout the major portion of its length presenting a split socket 18 into whichthe end of the handle is jammed or wedged. Of course, this socket might beformed in-.-Qth'er ways to facilitate its 'firm engagementwith v the brush handle but I find the particular type illustrated effective and desirable, be cause of its simplicity. ,Anapproximately circular extension 19 integral with theclosed end of the cylindrical socket member is formed on one face witha series of radially disposed locking teeth 20 adapted to mate with similar teeth 21 on the circular eXtremity 22 of an'upstanding arm 23 forming an integral part of thevmember 10b. The terminal portion of the arm and the extension of the socket are provided with: registering central openings 24receiv'ing a stud or screw '25 upon which a wing nut 26 works. ,T-he

nut and screw serving to normally maintain -with a central opening 27 in the circular plate 28from which the arm rises.'

The plate and the arm constitute the coupling member 10?), the plate being secured flatly against the flat surface of the boss and the central opening 27 in the plate registering with the opening 16 in the boss so that the screw 17 which is utilized for securing the member 10 to the brush head may also serve as a pivotal or rotary connection between the members 10 and 10b. Thenplate is formed with an arcuate slot .29 and a, binding screw 30 extending through the slot' works in a threaded socket 81 in the boss and carries a head 32 for clamping awasher 33 against the upper surface of the plateand preventing relative rotation of the plate and hose; It is thus possible by loosening the binding screw to orientate the brush head to any desiredangle relative to coupling member 10?) and then to lock the coupling member and the member 10 in adjusted position by tightening the screw.

Foradjus'tingthe angular relationship between the handle and the coupling member it is simply necessary to loosen the wing nut '26 rotate the handle on the screw 25 and then tighten the nut to force the toothed faces of the extension 19 and the terminal 22 of thejarm 23 into interlocking mating relationship) For facilitating this last mention ed pivotal adjustment of the handle, I pre far to form the mating radially toothed meter the interlocking memberswith oppfo's itelydisposed sockets 34 and to encircle the intermediate portion of the screw with a "eoiled xpansion spring 35 having its ends bearing in the sockets Thus when the spring nut 26 is loosened, the spring automatically separates the. toothed members 19, 22am moves them tofa position where they may be relatively rotated about the screw.

Itwill be noted that the arm is angularly disposed to the plate in order to bring its toothed terminal portionapproximately over the center of the plate. Thus the two centers of adjustment namely the center of piv- "otaladju'stment of the member 10a and the coupling and the center of rotary adjustment ofthe member 10 and the coupling are in direct alignment and ina plane disposed at right angles to the surface upon which the brush is adapted to act. By virtue of this construction when the parts are locked in any desired angular relationship and force or pressure on the handle tendingto urge the brush againstthe surface to be operated upon will'always be translated to said surface in terms of a substantially direct thrust. In other words, there is no substantial tendency for the brush to tilt or turn in operation regardless of its position relative to the operating handle.

When the invention is used with a brush having a convex back as shown the arcuate plate effectively serves to prevent relative rotation of the'brush and the member 105a;

When the member 10a, however, is used with a flat backed brush it is obvious that some means supplemental to the screw should be provided for preventing rotation in use. I

find that this maybe effectively accomplished andthe like. 7 Moreover, the invention is not confined in its application to implements,

but may obviously be applied'for the angular adjustment of any device mounted ona pedestal, bracket or other support. For instance, the invention is applicable as the joint between an electric fan and its supporting bracket, pedestal or other support, also to adjustable display racks and in numerous other relations in whichtwo elementsare to be readily set and maintained in adjusted position. The .manufacture and assembly of the parts is simple and direct and can be afiected by unskilled labor.

'It will thus be seen that there is herein described apparatus in which the several features of this'invention are embodierhand which apparatus in its actionattains the various objects oflthe invention and is well suited to meet the requirements of practical use.

i As many changes'could be made in the above construction and many apparently widely different embodiments of this invention couldbemade without departing from the scope thereof, it is int'ended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative andnot in a limlting case.

boss, asoc'ket member attachable to a brush handle, 'coupling member rotatablyconnected to the boss and pivotally connected to the socket member said coupling member including a circular plate a headed screw passed through aligned openings in. the center of the boss and plate holding them together and holding the arcuate plate to the brush, the screw being unthreaded. where it passes through the circular plateto permit rotation of the latterv over the surface of the bossabout the screw as a center means to clamp the circular plate: and. the boss together inv anydesired position of relative adjustment toloc'kwthem against relative movemenhan angular arm integral" the vedge of the late-and extendinginwardly over the center thereof, a radially; toothed surface at the extremity of the arm, said socket member including a radially toothed extension mating and adjustably interlocked with said first mentioned radially toothedv surface the prolonged axis of the coupling member bisecting the axes of the toothed members perpendicularly.

2. The combination with a brush havinga convex back of an arcuate plate conforming to the shape of the-back and secured thereto, a fiat topped circular boss integral with the plate, a second plate rotatably mounted centrally ofthe boss and having an arcuate slot therein, the means to secure the first mentioned plate to the brush to hold the two plates together and to serve as a rotary center for the circular plate comprising a headed screw passed through aligner openings in the plates and including an unthreaded portion at the region of the circular plate,

a clamping screw working through the slot and boss for locking the slotted plate against rotation relative to the boss, an angularly disposed arm rising from the edge of the slotted plate and extending inwardly over the center thereof, said arm terminating in a circular extension presenting a radially toothed surface "approximately perpendicular to the slotted plate, a socket member receiving a brush handle, an extension on the slotted plate similar to the terminal end of the arm and presenting a radially toothed face mating with the toothed face of the extension, a bolt passed through the two toothed members and means for efiecting relative movement thereof along the bolt to move the toothed faces into locking engagement, with the brush handle disposed in any desired angular relationship relative to the brush the prolonged axis of the coupling member bisecting the axes of the toothed members perpendicularly.

Signed at New York, in the county of New York and State of New York this 12th day of September, A. D. 1924.

HARRY HURASON. 

